OS X 10.10 vs. Ubuntu 14.10 vs. Fedora 21 vs. openSUSE Factory

Using LLVM Clang still means much faster compile times than GCC-based environments.

When the compiler doesn't get in the way, the performance can be quite close between operating systems.

OS X 10.10 will also be more competitive when Clang/Xcode properly supports OpenMP, which will hopefully be with the upcoming LLVM 3.6 release.

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